Red disazo dye.



W-"3 1, v "m i I m UldllilniD tiiirrarara "ear 1. iin Max can'ron,

sonar'r rtin OF BEBLIN-FRIEDENAU, GERMANY, ASSIGNOR T6 ACTIEN GESELL- ANILIN FABRIKATIGN. OF BERLIN, GEEMANY.

nnn nrsazo DYE.

No Drawing.

Specification of Letters Patent.

Patented Get. 22.1%?2.

Application filed February 12, 1912. Serial No. 677,099.

To all whom ta may concern:

Be it known that 1. MAX CANTOR, a citizen of the German Empire, residing;- at Berlin- Friedenau, Germany, my post-oliice address bein Hiihnelstrasse Berlin-Friedenau.'

and a Q-naphtholsulfonic acid. These dyes produce on wool from an acid bath red shades. Their dried and pulverized sodium salts are reddish brown powders, soluble in water to red solutions, not changing their color by addition of sodium carbonate or a dilute acid, but becoming bluer by soda-lye or ammonia. In alcohol they are sparely soluble with reddish color. The solution in concentrated sulfuric acid is blue. On addition of ice the dye is separated. By action of strong reducing agents the dyes are split off, yielding aminodiarylethersulfonic acids of the benzene series, para-diamins of the benzene series and l-amino-Q-naphtholsult'onic acids.

The following examples show, how the new dyes may be manufactured. The parts are by weight:

Example 1: 28.7 parts of the sodium salt of 2-aminodiphenylethen l-sulfonic acid are dissolved in water and diazotized by means of 30 parts of hydrochloric acid B. and 6.9 parts of sodium nitrite. The diazo compound is mixed with an aqueous solution of 11 parts of 3-toluidin and 11 parts of hydrochloric acid 20 Be. By adding sodium acetate the combination is finished. Then the amino-azo compound is filtered oil, washed, dissolved in water with the sufiicient quantity of soda-lye and mixed with 7 parts of sodium nitrite. This solution is allowed to flow into 35 parts of cooled hydrochloric acid 20 The diazo compound is combined with parts of the sodium salt of the acid, dissolved in water with 27 parts of calcined sodium carbonate. The mass is warmed and the dye salted out.

Example 2: Diphenylet-her-2-sulfonic acid-s -azo-anilin is produced by saponifying the combination product of t-diazodiphenylether-Q-sultonic acid with toluene-s1ilfanilid ot the formula:

ofineuusoicfiuiona,

or by treating with hot caustic SOClzl-hft the combination product of the same (ll-a7.- odiphenylether sult'onic acid with phenylamino-methone-omega-sultonic acid of the formula CGH5.NH.OH2.SO3H,

the reaction being explained by the come tion:

C5H5.OC$H3.(SO3N21)-N=N.C5H4.NH.CH2 sogulwnaou= cfinaooni. soma naucan NH +1lCH.O-$-NaQSO 36.9 parts of this product are dissolved in water with a parts of plienylhydroxid. The solution is mixed with 6.9 parts oi sodium nitrite and is run into a cooled hydrochloric acid, containing parts of acid 52L B. The diazo compound is combined with 25 parts of the sodium salt of Q-naphtholbsulfonic acid, dissolved in water, with 25 parts of calcined sodium carbonate. When the combination is complete the dye is heated and salted out.

My present invention-is not limited to the foregoing examples or to the details given therein. Thus, for instance, instead of the aminodiphenylether sulfonic acids their homologues and halogen-substitution deriv- 'atives may be used, whereas for anilin and 3-toluidin the 2-toluidin may be substituted.

Having now described my invention and in what manner it may be performed what I claim is,-

1. As new articles of manufacture the new disazo dyes dyeing wool red from an acid bath which derive from an aminodiarylethersulfonic acid of the benzene series, a monamin of the benzene series and a 2- naphtholsulfonic acid, their dried and pulverized sodium salts being reddish-brown powders, soluble in water to red solutions, not changing their color by addition of sodium carbonate or dilute acids, but becoming bluer by soda-lye or ammonia; being sparely soluble-in alcohol with a reddish color; being dissolved in concentrated sulfuric acid to a blue solution, from which on addition of ice the dye is separated; being split off by action of strong reducing agents, yielding aminodiarylethersulfonic acids of the henzene series, para-diamins of the benzene series and l-amino-Q-naphtholsulfonic acids.

2. As a new article of manufacture the its 'dried and pulverized sodium salt being a reddish brown powder, soluble in Water to a red solution, not changing the color by addition of sodium carbonate or dilute acids,

but becoming blu'er by soda-lye or ammonia;

being sparely soluble in alcohol with a reddish color; being dissolved in concentrated sulfuric acid toa blue solution, from which on addition of ice the dye is separated; being split oil by action of strong reducing agents, yielding 4 aminodiphenylether 2 sulfonic acid, lA-phenylenediamin and l-amino-2- naphthol-G-sulfonic acid.

In testimonyiwhereof I have hereunto set my hand in presence of two subscribing witnesses.

MAX CANTOR. -Witnesses:

HENRY HASPER, WOLDEMAR HAUPT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents,

' Washington, D. G. 

